Water-tube boiler



April 2, A. c DANKS 1,707,627

' WATER TUBE BOILER Filed Jan. 17, 1927 INVENTOR Patented 2 1929.

L anne-S ATE Armani) o, i ANKs; or CLEVELANDQOHIIQ, ,ASSIGNOR oroNE-Hli r or MONTCLAIR, NEW JERSEY.

meme sor MARTIN,

s. rA-TE'NroFF c13.;

Application filed January 17, 1927. Serial No. 161,532.

The invention relates to water tube boiler constructions and particularly to the vertical type employing an upper drum and a bottoni drum with a plurality of sets of tubes (pref: erably three) extending from the bottom drum to the upper drum. The invent-ionhas to do with the baffle arrangement, and involves a radical departure from the established practice in boilers of'thi'stypeZ Here'- tofore, it has been customary toarrange the baffles so that the gases of combustion, in

"and between the banks of tubes,' travel 1on gitudinally thereof, making relatively sharp bends adjacent the ends of the tube banks.

' In the present construction, the ba ifl'eslare .so arranged that the gasesof "combustion cross the various banks of tubes at substantia'lly right anglestheretoj The arrangement also resultsfinflan increase 111 the area of the available heating 'surfacein 'the first and second passes, where the teinpe'ratures V tubes v5 andel, so'that the gases of combustion:

' of construction, involving a departure from previous practice," and giving ahigher efiiciency, is the arrangement of the baffles so that the net-cross sectional area in the-passes, from the first to the last, decreases, following in a measure the law of contracting gases,

due to cooling. This tendsto prevent any.

reduction in the velocity ofthe gases, and increases the efiiciency of the construction.

A further object attained is a "larger net area in clearance space between the tubes at the various passes, suchareas being in all cases greater than the area of damper,'so-

that the draft losses at the passes are reduced to a minimum. One 'embojdrm'ei'it of the invention is illustrated intheaccompanying draw1ng,where1n: I

Figure 1 is a vertical section through a water tube boiler constructed in accordance Withthe inventionf Referring to Fig. 1' of the drawings, 1 vis the lower drum, 2 is the upper drum, and 3,

4 and 5 are'the front, middle and rear banks of 'water tubes respectiyely.- In the-part1.cu-;

lar construction shown,-the boiler is" fired by suitable gas burnersdirected through the openings 6Iand 7,but lt'will beunderstood that the boiler may be provided-with-the' usual liand'fired grates', or with any automatic stoker, or" may befiredby any otherap proved nuefihodQf Following the usual pracand to the front."

tiee, thez side of the construction on which the gases firstfpass-the tubes, will be re-' ferred-to as the front side, vand'the other side (left) onwhichgthe outlet flue Sis located, \vlllbe referred 'lJO as the rear side, the banks ignatedi v v The flow of the gasesof combustionacross ,thebanks of tubes 3, 4 and 5 is governed fand' to or sets of tubes be ng correspondingly destions, the'low er section9 extending longitua T dinally of thetubes 3, while the. upper. section 10. extends transversely of the tubes ,3,- a and :5, so that the gases of .-'co1nbustion sweepa'cr'oss the' upper. portions of allthree banks of tubes' before I The secondfbaflie 11 extends inward from" the rear wall,.12 [of the setting across the are causedto sweep across the tubes Sande they flow downwardly and into the tubes of the set 3,: after which they pass forwardly and, downwardly across thelower portions of the tubest and 5 to thestack outlet 8,11 The 'baliles' arefprefveiably composed of suitable reinforced'plas- .tic material. I V v v v I Y The baillesare preferably so arranged that.

the not cross sectional areas in the passes from the first tothe last, ,decrease'to correspond to the shrinkageof the gases in cool- 7 ing, and thetubesin themiddle bank 4t are divided by the two baflles into three sections increasing in length from the bottom section. up, The net cross sectional areas of the passes, as comparedwith the damper area,

is such that proper draft is insured.

'lheadvantages incident 'to the bafiiearrangemjent have been already set fortl1,herev tofore, and include improved dr'aft conditlonsand'lncreased heat absorbing qualit es,

so that the arrangement materially increases the rating of boilers to; whlclr they are ap- --plied.- The bends atthe' ends of the passes are also more gradual, and; there are no contractions. 1n crossysectional area 1n the va'- riou's passes to point below that the] "damp'eror flue area, or any dead spaces n WhlCh gases are not inmotion, so that the] draft conditionsare favorable. The avail 'able heating surface'ln the: first and second" passes, where, the temperatures are highest is relatively. large as compared with previ the battle cost is far below that incident to battles of theusual type as employed in boilers of the character spec fied. The location of the battle section 9 in the bank of tubes 3 involves an advantage, as the portions of the tubes to the right of the section, are thus exposed to and receive the full benefit of the radiant or reflected heatfrom the opposite wall 13 of the combustion chamber, while the tubes tothe left of this section 9 which are too far in to receive any substantial benefit from the reflected heat from the wall 13, are exposedto, and given the benefit of, the heated gases of combustion as they sweep along and across the tubes in making the turn.

What I claim is: 1. In combination ina boiler of the vertical type, having a lower drum andanupper drum arranged in substantially vertical alinement one above the other'and three sets or banks of Water tubes extending upward from the lower drum to the upper drum, a fire box, an outlet flue at the rear of the boiler at the lower portion thereof, a batlle extending from the lower drum longitudinally of the tubes of the front bank for a portion of their length and then transversely of such tubes and across the middle bank of tubes and across the space between the middle and rear banks of tubes and terminating short of the rear side of the rear banks of tubes, and a second battle extending inward from the vertical rear wall of the boiler setting across the rear bank of tubes and into the middle bank of tubes and spaced below the transverse portion of the first baflle.

2. In combination in a boiler of the vertical type, having a lower drumand an upper drum arranged in substantially vertical alinement one above the other, and three sets or banks of water tubes extending upward from the lower drum to the upper drum, a the box, an outlet flue at the rear of the boiler at the lower portion thereof, a baffle extending from the lower drum longitudinally of the tubes of the front bank for a portion of their length andthen trans versely of, such tubes and across the middle bank of tubes and across the space between the middle and rear banks of tubes and terminating short of the'rear' side of the rear banks of tubes, and a second bafle extending inward from the vertical rear wall of the boiler setting across the rear bank and into the middle bank of tubes and spaced below' the transverse portion of the first bafile, the

portion of the first-bathe which extends longitudinally of the frontvbank of tubes being located between the rear tube of such bankand the front tube thereof. 7

In testimony whereof, I have hereunto subscribed my name this 10th day of January, 1927. i

ALFRED c. BANKS: 

